English: Willie Rosenstein was a World War I ace and a pre-war aviation pioneer. He was born in Stuttgart on January 28, 1892. Because he had a keen interest in engines and cars, he decided to become a motor engineer. In 1912 he earned his pilot’s license (No. 170) at the famous flying school at Johannisthal. Soon afterwards he became a flight instructor, a test pilot, and a contestant in airplane competitions. His great flying talent made him nationally known. When war was declared in 1914, Rosenstein volunteered for duty as a pilot. At first he piloted two-seaters: while he flew the plane, another man would observe the enemy below. Later in the war the observers were armed with machine guns and participated in air combat. Pilots of one-seaters had both jobs of flying and shooting, and Rosenstein eventually became the pilot of a one-seater. From February to December 1917, Rosenstein was a member of Jasta 17, which was under the command of Lieutenant Hermann Goering. (Jasta was short for Jagdstaffel, or squadron. It was part of a Jagdgeschwader, or wing.) Rosenstein had his first confirmed aerial victory while in Jasta 17. In late 1917 an incident occurred in which Rosenstein became very upset after Lt. Goering made an anti-Semitic remark in front of several people; Rosenstein requested an apology but when Goering refused, Rosenstein asked for a transfer out of the unit. In Rosenstein’s official assessment, Goering wrote that Rosenstein was a fine pilot but that he was suffering from nervous exhaustion, and for a short while Rosenstein was assigned border duty. He eventually was transferred to Jasta 40, led by Lt. Carl Degelow, and Rosenstein flourished under his command. Rosenstein shot down several more enemy aircraft and was even made Deputy Staffelführer (squadron leader). Rosenstein always received excellent assessments from Degelow. Rosenstein received credit for shooting down seven enemy aircraft (shooting down five or more made you an “ace”), but he most probably deserved credit for two additional victories. His last two victories occurred near the end of the war and as a result, his claims were never officially processed. Among the decorations he received for his wartime service were the Iron Cross (First Class), the Order of the Zaringer Lion, and the Württemburg Service Medal in Gold.